Evaluation of Nutrient Components and Nutritive Quality of Larimichthys crocea Big Yellow Croaker） in Different Aquaculture Models

摘要

To ascertain the nutrient components and nutritive quality of the flesh of big yellow croaker in three culture conditions( traditional cage,offshore cage and cage-free),basic nutritional components,amino acid,fatty acid and mineral elements were determined. The results indicated that crude protein in flesh of the big yellow croaker in cage-free culture was higher than that in offshore cage and much higher than that in traditional cage( P < 0. 05). Crude fat of the croaker cultured in the traditional cage was twice as high as that in cage-free culture,while that in the offshore cage was in the middle. Proline content in the cage-free culture was much higher than that in the offshore cage,and also than that in the traditional cage( P < 0. 05). There was no significant difference in the content of alanine,methionine and tryptophan( P < 0. 05). Contents of other amino acids had no significant difference between the cage-free culture and offshore cage,but were much lower in the traditional cage( P < 0. 05). Top six fatty acids were 9-Hexadecenoic acid,palmitic acid,9-Octadecenoic acid,Octadecanoic acid,DHA and EPA. The palmitic acid content was the highest in cage-free culture and in traditional cage,9-Octadecenoic acid content was the highest in offshore cage. Content of unsaturated fatty acids in cage-free culture,offshore cage and traditional cage was 63. 60,66. 32,57. 67,respectively,and polyunsaturated fatty acid was 29. 10,28. 57,and24. 40. Content of DHA in cage-free culture was significantly higher than that in the offshore and traditional cage. Content of zinc had no significant difference in three culture models. Content of phosphorus had no significant difference between that in cage-free culture and offshore cage,was lower in the traditional cage. The cage-free cultured croakers had the highest content of calcium and phosphorus. Content of selenium was about the same between the offshore cage and the traditional cage stocking,higher in the cage-free culture. This research has considerable application value for identifying quality and sources of the big yellow croakers.